Engineering
From the outside, the Kölnbrein water dam, operated by Verbund in Carinthia, which is Austria's highest dam, and the DC Tower in Vienna, Austria's tallest building, do not have much in common, but for a research group around ...
Dec 27, 2023
0
15
Telecom
The boss of European satellite operator Eutelsat knows her task will not be easy: to forge a competitor to Elon Musk's Starlink and provide superfast internet from space.
Nov 15, 2023
0
1
Business
Germany has blocked a complete Chinese takeover of a satellite startup on national security grounds, sources close to the matter told AFP Thursday, as Berlin takes an increasingly hard line against Beijing.
Sep 14, 2023
0
4
Business
Viasat, based in Carlsbad, California, has completed its $6.1 billion acquisition of London-based Inmarsat on Wednesday —accelerating the company's bid to become a global supplier of satellite broadband for aircraft, ships, ...
Jun 1, 2023
0
3
Telecom
A microsatellite for maritime communications developed by the Satellite Technology And Research Center (STAR) under the National University of Singapore's College of Design and Engineering (NUS CDE), and A*STAR's Institute ...
Apr 24, 2023
0
3
Machine learning & AI
The interaction of machine learning and optics/photonics is transforming the way we design new photonic structures, unearth latent physical laws, and develop intelligent photonic devices. Despite certain achievements, a major ...
Mar 31, 2023
0
15
Internet
Within the rapidly changing landscape of data providers, governments must address concerns over who collects and uses data to support the public interest. Dr. Peter Johnson, a geographer at the University of Waterloo, is ...
Feb 23, 2023
0
8
Engineering
The most popular electric propulsion technologies used for miniature satellites—the Hall Thruster—has major limitations. Now, new research, led by Michael Keidar, the A. James Clark Professor of Engineering at the George ...
Sep 29, 2022
0
37
Engineering
Russia is building a new ground-based laser facility for interfering with satellites orbiting overhead, according to a recent report in The Space Review. The basic idea would be to dazzle the optical sensors of other nations' ...
Jul 27, 2022
0
6
Security
A malicious software command that immediately crippled tens of thousands of modems across Europe anchored the cyberattack on a satellite network used by Ukraine's government and military just as Russia invaded, the satellite ...
Mar 30, 2022
0
3
In the context of spaceflight, a satellite is an object which has been placed into orbit by human endeavor. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon.
The first artificial satellite, Sputnik 1, was launched by the Soviet Union in 1957. By 2009 thousands of satellites have been launched into orbit around the Earth. These originate from more than 50 countries and have used the satellite launching capabilities of ten nations. A few hundred satellites are currently operational, whereas thousands of unused satellites and satellite fragments orbit the Earth as space debris. A few space probes have been placed into orbit around other bodies and become artificial satellites to the Moon, Venus, Mars, Jupiter and Saturn.
Satellites are used for a large number of purposes. Common types include military (spy) and civilian Earth observation satellites, communication satellites, navigation satellites, weather satellites, and research satellites. Space stations and human spacecraft in orbit are also satellites. Satellite orbits vary greatly, depending on the purpose of the satellite, and are classified in a number of ways. Well-known (overlapping) classes include low Earth orbit, polar orbit, and geostationary orbit.
Satellites are usually semi-independent computer controlled systems. Satellite subsystems attend many tasks, such as power generation, thermal control, telemetry, attitude control and orbit control.
This text uses material from Wikipedia, licensed under CC BY-SA
